Stupid question, but I will ask anyway. Is it at all possible that something is rattling around inside the door storage packet?
I am not familiar with how the Canadian warranty might differ from the warranty in the United States, but clearly here a defective speaker would be covered under the warranty.
I am making the assumption that since you are a student you are young. Could this be a case of a dealer trying to take advantage of a young, inexperienced customer? Which dealer is this? No doubt some of our Canadian friends would be interested in the customer service levels at the different dealers.
Love your screenname. If I owned a Porsche when I was a student, I would have been broke too!